87 V/AN
Service Manual
22
Reassembling the Meter Case
To reassemble the Meter case:
1.
Verify that the rotary knob and circuit board switch are in the
OFF
position, and that
the gasket remains secured to the bottom case.
2.
Place the PCA into the bottom case.
3.
Place the case top on the case bottom.
4.
To avoid damaging the battery wire, ensure the wire exits the middle of the battery
compartment.
5.
Properly seat the case gasket and snap the case halves together above the LCD end.
See Figure 2.
6.
Reinstall the three case screws and the battery door.
7.
Secure the battery door by turning the screw 1/4-turn clockwise.
8.
Go to “Performance Tests” later in this document, and perform the procedures
described.
Replacing the Battery
Replace the battery with a 9-V battery (NEDA A1604, 6F22, or 006P).
XW
Warning
To avoid false readings, which could lead to possible electric
shock or personal injury, replace the battery as soon as the
battery indicator (
b
) appears. If the display shows
“
bAtt
”
the
Meter will not function until the battery is replaced.
Replace the battery as follows, refer to Figure 2:
1.
Turn the rotary knob to
OFF
and remove the test leads from the terminals.
2.
Remove the battery door by using a standard-blade screwdriver to turn the battery
door screws one-quarter turn counterclockwise.
3.
Remove the old battery and replace it with a new one.
4.
Align the battery leads so that they not pinched between the battery door and the
case bottom.
5.
Secure the door by turning the screws one-quarter turn clockwise.
Testing Fuses and Current Circuitry
If a test lead is plugged into the
mA/
µ
A
or
A
terminal and the rotary knob is turned to a
non-current function, the Meter chirps and flashes “
LEAd
” if the fuse associated with
that current terminal is good. If the Meter does not chirp or flash “
LEAd
”, the fuse is bad
and must be replaced. Refer to Table 17 for the appropriate replacement fuse.
Before measuring current, test the quality of the appropriate fuse and the current shunt
using the following procedure. See Figure 4.
1.
Turn the rotary knob to
N
.
2.
To test F2, insert a test lead into the
I
input terminal and touch the probe to
the
A
input terminal.
Note
The input receptacles contain split contacts. Be sure to touch the probe to
the half of the receptacle nearest the LCD.
